Year	Number
2004-01-01	0.1435
2005-01-01	0.1457
2006-01-01	0.1479
2007-01-01	0.1479
2008-01-01	0.1502
2009-01-01	0.1502
2010-01-01	0.1546
2011-01-01	0.1568
2012-01-01	0.1789
2013-01-01	0.1789
2014-01-01	0.1789
2015-01-01	0.1811